How many mm in an inch?
There are 25.4 millimeters in one inch. Screen and screw sizes often mix the two.
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Conversion chart
| Inch | Millimeters |
|---|---|
| 0.25 inch | 6.35 millimeters |
| 0.5 inch | 12.7 millimeters |
| 1 inch | 25.4 millimeters |
| 2 inch | 50.8 millimeters |
| 3 inch | 76.2 millimeters |
| 4 inch | 101.6 millimeters |
| 5 inch | 127 millimeters |
| 10 inch | 254 millimeters |
In practice
Screen and screw sizes often mix the two. When a recipe or plan has to be exact, convert once and write the number down instead of converting each step.
Frequently asked questions
How many mm in an inch?
There are 25.4 millimeters in one inch.
How do I convert inch to millimeters?
Multiply the number of inchs by 25.4.
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